Uncle Al,
I had an encouraging initial result yesterday. I weighed out my black oxide (37 gms, which I suspect might actually be FE3O4) then mixed in what seemed the right amount of aluminum dust. It burned fast and hot. The iron came out in about 5 chunks chunks, which I fused together with an arc between to carbon electrodes. You can see the result at:
I guess the next part of this project will be to build a proper furnace for use in heating and forging my iron.
I should have photographed the black oxide particles under my microscope. The particles appear to me to be sized at about 100 microns, max, and typically about half that size. I'm wondering how it formed in that way. I'm also wondering what portion of it might be relatively recent, i.e., having fallen from the sky. I'd appreciate any thoughts on this.
Bob